EP4386935A1 - Wärmetauscherplatte, batterie, elektrische vorrichtung und herstellungsverfahren für batterie - Google Patents

Wärmetauscherplatte, batterie, elektrische vorrichtung und herstellungsverfahren für batterie Download PDF

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Publication number
EP4386935A1
EP4386935A1 EP21969372.8A EP21969372A EP4386935A1 EP 4386935 A1 EP4386935 A1 EP 4386935A1 EP 21969372 A EP21969372 A EP 21969372A EP 4386935 A1 EP4386935 A1 EP 4386935A1
Authority
EP
European Patent Office
Prior art keywords
heat exchange
exchange plate
battery
plate
heating film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21969372.8A
Other languages
English (en)
French (fr)
Inventor
Liangyi WANG
Haihua Huang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Publication of EP4386935A1 publication Critical patent/EP4386935A1/de
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H01M10/6555—Rods or plates arranged between the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/647—Prismatic or flat cells, e.g. pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H01M10/6557—Solid parts with flow channel passages or pipes for heat exchange arranged between the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
    • H01M10/6571—Resistive heaters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • This application relates to the field of battery technology, and in particular, to a heat exchange plate used for batteries, a battery, an electric apparatus, and a manufacturing method of battery.
  • This application is completed in view of the above issues, and aims to provide a heat exchange plate for batteries capable of reliably exchanging heat with high safety, a battery, an electric apparatus including the battery, and a manufacturing method of battery.
  • a first aspect of this application provides a heat exchange plate for battery, including a heat exchange plate body and a packaging plate, the heat exchange plate body has a cooling zone and a heating zone; and the packaging plate is fixedly mounted on the heat exchange plate body, where an accommodating cavity is formed between the packaging plate and the heating zone of the heat exchange plate body, and a heating film is provided in the accommodating cavity.
  • the heating film is packaged between the heat exchange plate body and the packaging plate fixed to the heat exchange plate body, reliable fixation between the heating film and the heat exchange plate body can be ensured while avoiding issues such as delamination and overheating caused by direct contact between the heating film and adjacent battery cells. Such arrangement can also prevent adverse situations such as metal particles piercing the heating film and causing short circuits in the battery cells.
  • the heat exchange plate body is divided into the cooling zone and the heating zone. As compared to a conventional arrangement where the cooling plate and the heating film overlap, the heat exchange plate can be directly attached to the battery cell. This ensures a strong bonding strength between the heat exchange plate and the battery cell, and implements balanced cooling and heating for the battery cell on the side of the battery cell.
  • the cooling zone and the heating zone of the heat exchange plate body do not overlap with each other.
  • the heat exchange plate can be directly bonded to the battery cells without the heating film in between, ensuring high bonding strength and cooling efficiency between the heat exchange plate and the battery cell. This also allows for thermal management of the battery cell based on heating or cooling needs of different parts of the battery cell, thereby ensuring temperature uniformity across the battery cell.
  • the packaging plate is welded to the heat exchange plate body in a manner that the heating film is closely attached to the heat exchange plate body.
  • the packaging plate is fixed to the heat exchange plate body through welding, reliable fixation can be achieved.
  • This method features easy operation and simple structure.
  • the heating film can be closely attached to the heat exchange plate body through welding connection, which ensures effective heating of adj acent battery cells by the heating film while avoiding adverse situations such as delamination of the heating film.
  • the packaging plate is attached to the heating film with a thermally conductive adhesive in between.
  • thermally conductive adhesive is sandwiched between the packaging plate and the heating film, close contact between the heating film and the heat exchange plate body can be further ensured, facilitating efficient heating of the battery cell. Furthermore, the use of the thermally conductive adhesive helps to evenly transfer heat from the heating film to the packaging plate, ensuring uniform heating of the battery cell.
  • the thermally conductive adhesive is thermally conductive silicone gel.
  • thermally conductive silicone gel can improve the use reliability and service life of the heat exchange plate and reduce maintenance costs.
  • the packaging plate is welded to the heat exchange plate body at a position avoiding the heating film.
  • the packaging plate is welded to the heat exchange plate body at a position avoiding the heating film, heating performance of the heating film is not compromised by the welding material or the welding position.
  • multiple or continuous welding can be performed around the heating film at positions avoiding the heating film to increase a compressive force that enables the heating film to be closely attached to the heat exchange plate and the packaging plate.
  • the heating film is in a thin sheet form, and the heating film is arranged serpentinely in a closed ring or a non-closed shape within the heating zone.
  • the packaging plate includes a peripheral welding portion and a central welding portion, where the peripheral welding portion surrounds the heating film at edge of the heating zone, and the central welding portion is formed in the heating zone at a position different from the peripheral welding portion and avoiding the heating film.
  • the heat exchange plate can be made thinner.
  • the heating film is arranged serpentinely in a closed ring or non-closed shape within the heating zone, so that the heating film can be distributed as evenly as possible throughout the heating zone or uniformly heat the entire heating zone.
  • the packaging plate includes the peripheral welding portion and the central welding portion, the peripheral welding portion surrounds the heating film and is formed at the edge of the heating zone, and the central welding portion is located at a position in the heating zone different from the peripheral welding portion and avoiding the heating film.
  • welding can be performed around the periphery of the heating zone (that is, the periphery of the packaging plate) to apply compressive force to the heating film, and welding can also be performed in the central portion of the heating zone (the central portion of the packaging plate) to apply compressive force to the heating film, so that the entire heating film is tightly pressed against the heat exchange plate body and the packaging plate, and the heating film in different portions of the heating zone receives approximately consistent stress.
  • a cooling flow path is formed in the heat exchange plate body of the cooling zone for the passage of a cooling medium.
  • the cooling zone can function as a cooling plate when the cooling medium flows, cooling the adjacent battery cells.
  • both the heat exchange plate body and the packaging plate are aluminum components.
  • a second aspect of this application provides a battery, including at least one battery cell and at least one heat exchange plate, where the heat exchange plate is the heat exchange plate according to the first aspect of this application, and the heat exchange plate is disposed near each battery cell.
  • the heat exchange plate is disposed near the first heat exchange surface of each battery cell.
  • the heat exchange plate is disposed near the relatively large heat dissipation surface of the battery cell or near a heat exchange surface of the battery cell with obvious uneven temperature distribution, so as to achieve uniform and efficient cooling and/or heating of the battery cell and the battery.
  • the heat exchange plate disposed between adjacent battery cells has a higher heat exchange capacity compared to the heat exchange plate disposed at an end side.
  • the heat exchange plate sandwiched between adjacent battery cells has better heat exchange capacity than the heat exchange plate disposed at the end, helping ensure temperature uniformity for the entire battery.
  • the cooling flow path formed in one heat exchange plate body for the cooling medium to pass through is connected in parallel with the cooling flow path formed in another heat exchange plate body.
  • the cooling flow paths of the heat exchange plates are connected in parallel, so that the cooling flow path in each heat exchange plate can operate independently, thereby improving the cooling efficiency for each battery cell and further ensuring temperature uniformity for the entire battery.
  • the battery further includes a second heat management plate disposed near a second heat exchange surface of the battery cell.
  • the heat exchange plate is disposed near the first heat exchange surface in a manner that the cooling zone is farther from the second heat management plate than the heating zone.
  • the heat exchange plate is disposed near the first heat exchange surface of the battery cell to serve as the first heat management plate.
  • a second heat management plate for cooling can also be disposed near the second heat exchange surface which is different from the first heat exchange surface, further improving the cooling efficiency.
  • the heat exchange plate is disposed in a manner that the cooling zone is farther from the second heat management plate than the heating zone, further enhancing the overall cooling efficiency and temperature uniformity of the battery.
  • the cooling flow path in the second heat management plate is connected in parallel with the cooling flow path in the heat exchange plate.
  • Connecting the cooling flow paths of each heat management plate in parallel can further improve the cooling efficiency and temperature uniformity of each battery cell and the entire battery.
  • a third aspect of this application provides an electric apparatus, including the heat exchange plate according to the first aspect or the battery according to the second aspect.
  • a fourth aspect of this application provides a manufacturing method of battery, including the following steps: providing at least one battery cell; providing at least one heat exchange plate, where the heat exchange plate is the heat exchange plate described in the first aspect of this application; and positioning the heat exchange plate near the battery cells.
  • each battery cell as well as the entire battery, receive uniform and efficient cooling and/or heating, without occurrence of issues such as delamination, overheating, or short circuit of the heating film.
  • This battery exhibits high reliability and safety in use.
  • the method further includes the following steps: providing the second heat management plate; and positioning the heat exchange plate near the first heat exchange surface of the battery and positioning the second heat management plate near the second heat exchange surface of the battery, where the cooling zone of the heat exchange plate is farther from the second heat management plate than the heating zone.
  • the step of providing at least one heat exchange plate includes: providing a heating film that is closely attached to the heat exchange plate body and the packaging plate; and welding the packaging plate to the heat exchange plate body at a position surrounding the heating film in the heating zone and at a position avoiding the heating film other than the position surrounding the heating film.
  • This application provides a heat exchange plate capable of implementing one of the following effects, a battery including such heat exchange plate, an electric apparatus including such battery, and a manufacturing method of battery.
  • heat exchange plate that ensures reliable fixation between the heating film and the heat exchange plate body, and is capable of reliably exchanging heat with high safety, without any adverse situations such as delamination of the heating film, overheating of the heating film, or short circuit in the battery cell caused by puncturing of the heating film.
  • the heat exchange plate can also ensure high bonding strength between the heat exchange plate and the battery cells and implement balanced cooling and heating of the battery cells.
  • a battery with reliable and efficient heat exchange performance and uniform heat exchange is provided, thereby delivering high reliability and high safety in use.
  • An electric apparatus with high reliability, high safety, and low maintenance costs is provided.
  • orientations or positional relationships indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “top”, “bottom”, “inside”, “outside”, and the like are based on the orientations or positional relationships shown in the accompanying drawings. These terms are merely for the ease and brevity of description of the embodiments of this application rather than indicating or implying that the apparatuses or components mentioned must have specific orientations or must be constructed and manipulated according to specific orientations, and therefore shall not be construed as any limitations on the embodiments of this application.
  • the terms “mount”, “connect”, “join”, and “fasten” should be understood in their general senses. For example, they may refer to a fixed connection, a detachable connection, or an integral connection, may refer to a mechanical connection or an electrical connection, and may refer to a direct connection, an indirect connection via an intermediate medium, an internal communication between two elements, or an interaction between two elements. Persons of ordinary skill in the art can understand specific meanings of these terms in this application as appropriate to specific situations.
  • a first feature being “on” or “under” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary.
  • the first feature is “above”, “over”, or “on” the second feature may mean that the first feature is directly above or obliquely above the second feature or simply mean that the first feature has a higher level than the second feature.
  • That the first feature is "below”, “beneath”, and “under” the second feature may mean that the first feature is directly below or obliquely below the second feature or simply mean that the first feature has a lower level than the second feature.
  • a cooling plate or other means for thermal management are typically configured.
  • the thermal management includes not only suppressing temperature rise but also promoting temperature rise when the temperature of the battery is excessively low. Therefore, technical solutions such as attaching a heating film layer to a cooling plate has been proposed in the related technology, which combines both cooling and heating functions for the battery.
  • the cooling plate with the heating function in the related technology still have some safety issues.
  • the inventors of this application have found through observation and study that the heating film layer on the cooling plate with the heating function in the related technology has issues such as delamination. In a case that the heating film layer delaminates, there is a significant safety risk of overheating or even ignition if the heating film continues to be powered for heating. In addition, there are adverse situations that the heating film layer is punctured by metal particles.
  • this application provides a heat exchange plate capable of reliably perform heat exchange for cooling and heating, without experiencing issues like delamination, overheating, or puncturing of the heating film, a battery using such heat exchange plate, an electric apparatus including such battery, and a manufacturing method of battery.
  • the battery involved in this application may be any battery, for example, a battery module and a battery pack, or a primary battery and secondary battery.
  • the secondary battery includes a nickel metal hydride battery, a nickel-cadmium battery, a lead-acid (or lead storage) battery, a lithium-ion battery, a sodium-ion battery, a polymer battery, and the like.
  • Such battery is applicable to various electric devices that use batteries, for example, mobile phones, portable devices, notebook computers, electric bicycles, electric toys, electric tools, electric vehicles, ships, and spacecrafts.
  • spacecrafts include airplanes, rockets, space shuttles, and spaceships.
  • the battery is used to supply electrical energy to these electric devices.
  • FIG. 1 is a schematic structural diagram of a vehicle 1 according to an embodiment of this application.
  • the vehicle 1 may be a fossil fuel vehicle, a natural-gas vehicle, or a new energy vehicle, where the new energy vehicle may be a battery electric vehicle, a hybrid electric vehicle, a range-extended vehicle, or the like.
  • the vehicle 1 is provided with a battery 10 inside, where the battery 10 may be disposed at the bottom, front, or rear of the vehicle 1.
  • the battery 10 may be configured to supply power to the vehicle 1.
  • the battery 10 may be used as an operationally power source for the vehicle 1.
  • the vehicle 1 may further include a controller 11 and a motor 12, where the controller 11 is configured to control the battery 10 to supply power to the motor 12, for example, to satisfy power needs for start, navigation, and driving of the vehicle 1.
  • the battery 10 can be used as not only the operational power supply for the vehicle 1 but also a driving power supply for the vehicle 1, replacing all or a part of the fossil fuel or the natural gas to provide driving power for the vehicle 1.
  • the battery 10 may include multiple battery cells 20.
  • a battery cell 20 is a smallest element constituting a battery module or a battery pack.
  • the multiple battery cells 20 can be connected in series and/or in parallel through an electrode terminal for various application scenarios.
  • the battery involved in this application may include a battery module, a battery pack, or the like.
  • the multiple battery cells 20 may be connected in series, parallel, or series-parallel, where being connected in series-parallel means a combination of series and parallel connections.
  • the battery 10 in some embodiments of this application may be directly formed by multiple battery cells 20, or a battery module may be formed first, and then the battery module form a battery.
  • FIG. 2 schematically illustrate a structure of a battery 10 according to an embodiment of this application.
  • the battery 10 may include a box 30 and at least one battery cell 20 accommodated in the box 30.
  • the box 30 accommodates the battery cells 20 to prevent liquid or other foreign matter from affecting charge or discharge of the battery cells 20.
  • the box 30 may be a simple three-dimensional structure such as a separate rectangular structure, a cylindrical structure, or a spherical structure, or may be a complex three-dimensional structure formed by combination of simple three-dimensional structures such as a rectangular structure, a cylindrical structure, or a spherical structure. This is not limited in the embodiments of this application.
  • the box 30 may be made of an alloy material such as aluminum alloy and iron alloy, a polymer material such as polycarbonate and polyisocyanurate foam, or a composite material produced from materials such as glass fibers and epoxy resin. This is not limited in the embodiments of this application either.
  • the box 30 may include a first portion 301 and a second portion 302.
  • the first portion 301 and the second portion 302 fit together to jointly define a space for accommodating the battery cells 20.
  • the second portion 302 may be a box structure with one end open, and the first portion 301 may be a plate structure, where the first portion 301 covers the open side of the second portion 302 for the first portion 301 and the second portion 302 to jointly define a space for accommodating the battery cells 20.
  • the first portion 301 and the second portion 302 may both be box structures with one side open, where the open side of the first portion 301 is engaged with the open side of the second portion 302.
  • the battery cell 20 may be a lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, or the like. This is not limited in the embodiments of this application.
  • the battery cell 20 may be cylindrical, flat, rectangular, or another shape. This is not limited in the embodiments of this application either.
  • the battery cells 20 are typically divided into three types by packaging method: cylindrical battery cell, prismatic battery cell, and pouch battery cell. The type of battery is not limited in the embodiments of this application either. However, considering factors such as ensuring adhesive strength and cooling effectiveness, the embodiments of this application are particularly suitable for batteries in which the surface in contact with the heat exchange plate is substantially flat.
  • the battery cell 20 in the embodiments of this application typically includes an end cover, a housing, and a cell assembly.
  • the end cover refers to a component that covers an opening of the housing to isolate an internal environment of the battery cell 20 from an external environment.
  • a shape of the end cover may be adapted to that of the housing, so that the end cover can fit the housing.
  • the end cover may be made of a material with certain hardness and strength (for example, aluminum alloy), so that the end cover is less likely to deform under extrusion and collision, enabling the battery cell 20 to have higher structural strength and improved safety performance.
  • the end cover may be provided with functional components such as an electrode terminal.
  • the electrode terminal may be configured to be electrically connected to the cell assembly for outputting or inputting electrical energy of the battery cell 20.
  • the end cover may also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, which are not particularly limited in the embodiments of this application.
  • an insulator may further be provided at an inner side of the end cover.
  • the insulator can be configured to isolate electrical connection parts in the housing from the end cover, so as to reduce a risk of short circuit.
  • the insulator may be made of plastic, rubber, or the like.
  • the housing is an assembly configured to form the internal environment of the battery cell 20 together with the end cover, where the formed internal environment may be used to accommodate the cell assembly, an electrolyte (not shown in the figure), and other components.
  • the housing and the end cover may be separate components, and an opening may be provided in the housing, so that the end cover can close the opening to form the internal environment of the battery cell.
  • the end cover and the housing may also be integrated.
  • the end cover and the housing may form a shared connection surface before other components are disposed inside the housing, and then the end cover covers the housing when inside of the housing needs to be enclosed.
  • the housing may be of various shapes and sizes, such as a rectangular shape, a cylindrical shape, and a hexagonal prism shape.
  • the shape of the housing may be determined based on a specific shape and size of a cell assembly.
  • the housing may be made of various materials, for example, copper, iron, aluminum, stainless steel, aluminum alloy, and plastic. This is not particularly limited in the embodiments of this application.
  • the embodiments of this application are described by using a cylindrical battery cell 20 as an example. Therefore, the housing of the battery cell 20 is, for example, cylindrical.
  • the cell assembly is a component in which electrochemical reactions take place in the battery cell 20.
  • the cell assembly is mainly formed by winding or stacking a positive electrode plate and a negative electrode plate, and a separator is generally disposed between the positive electrode plate and the negative electrode plate.
  • the parts with active substances on the positive electrode plate and the negative electrode plate constitute a body portion of the cell assembly, and the parts without active substances on the positive electrode plate and the negative electrode plate each constitute a tab (not shown in the figure).
  • a positive tab and a negative tab may both be located at one end of the body portion or be located at two ends of the body portion respectively.
  • a positive electrode active substance and a negative electrode active substance react with an electrolyte, and the tabs are connected to electrode terminals to form a current loop.
  • FIG. 3 schematically shows a three-dimensional structure of a heat exchange plate 100 applied in the foregoing battery.
  • FIG. 4 is an exploded view of the heat exchange plate 100 according to an embodiment of this application.
  • FIG. 5 is a front view of the heat exchange plate 100 according to an embodiment of this application.
  • FIG. 6 is a sectional view along A-A.
  • FIG. 7 is an enlarged view of section B in FIG. 6 .
  • the heat exchange plate 100 for battery includes a heat exchange plate body 101 and a packaging plate 102.
  • the heat exchange plate body 101 has a cooling zone 101A and a heating zone 101B.
  • the packaging plate 102 is fixedly mounted on the heat exchange plate body 101, where an accommodating cavity 104 (referring to FIG. 7 ) is formed between the packaging plate 102 and the heating zone 101A of the heat exchange plate body 101, and the accommodating cavity 104 is provided with a heating film 103.
  • the heat exchange plate 100 herein functions as a part of the thermal management system in the battery, providing cooling and heating functions.
  • the heat exchange plate body 101 of the heat exchange plate 100 includes a cooling zone 101A and a heating zone 101B.
  • cooling zone 101A cooling flow paths or the like can be configured to cool the battery cell.
  • heating zone 101B a heating film or the like can be configured to heat the battery cell.
  • the heat exchange plate body 101 is in a flat plate shape and typically has an interconnected cavity in the cooling zone 101A. Therefore, the heat exchange plate body 101 can be formed through forming processes such as stamping or blow molding, or formed by welding.
  • the packaging plate 102 as shown in FIG. 4 and FIG. 7 , is generally flat with a slight elevation in the central body.
  • a flat cavity that is, the accommodating cavity 104
  • the accommodating cavity 104 accommodates the heating film 103.
  • the heating film 103 is fixed to the heat exchange plate body 101 by being sandwiched between the heat exchange plate body 101 (heating zone 101B) and the packaging plate 102.
  • the heating film 103 for example, has resistance wires inside and insulation materials outside, enabling electrical heating.
  • the heating film 103 is generally in the form of a thin film and has a shape that substantially matches the internal space of the accommodating cavity 104. Thickness of the heating film 103 is not particularly limited and can be, for example, around 0.5 mm.
  • the heat exchange plate body 101 In the case of using such heat exchange plate 100 for cooling the battery cell 20, the heat exchange plate body 101, particularly the cooling zone 101A of the heat exchange plate body 101, can be directly attached to the battery cell 20.
  • the packaging plate 102 can also be directly attached to the battery cell 20.
  • both sides of the heat exchange plate 100 can be attached to the batteries.
  • the heating film 103 is packaged between the heat exchange plate body 101 and the packaging plate 102 fixed to the heat exchange plate body 101, the reliable fixation between the heating film 103 and the heat exchange plate body 101 is ensured. Such arrangement also prevents delamination and fall-off due to direct contact between the heating film 103 and its adjacent battery cells 20. In addition, even if the battery cells swell or deform during use, the heating film 103 is less likely to delaminate or fall off.
  • the heating film 103 is packaged and protected by the heat exchange plate body 101 and the packaging plate 102, adverse situations such as a short circuit in the battery cell due to metal particles in the battery piercing the heating film 103 can be avoided.
  • the heat exchange plate body 101 is divided into the cooling zone 101A and the heating zone 101B, as compared to a conventional arrangement that the cooling plate and the heating film overlap, the heat exchange plate 100 can be directly attached to the battery cell 20. This ensures a strong bonding strength between the heat exchange plate 100 and the battery cell 20, enabling balanced cooling and heating for the battery cell 20 from the side of the battery cell 20.
  • the cooling zone 101A and the heating zone 101B of the heat exchange plate body 101 do not overlap.
  • the "not overlap” includes any of the cases of partial non-overlapping and full non-overlapping.
  • the heat exchange plate 100 can be directly attached to the battery cell 20 without the heating film 103 in between. This ensures a high bonding strength and cooling efficiency between the heat exchange plate 100 and the battery cell 20.
  • This also allows for thermal management of the battery cell 20 based on heating or cooling demands of different portions the battery cell 20, ensuring overall temperature uniformity of the battery cell 20.
  • a central portion in the height direction (up and down direction in FIG. 2 ) of the battery cell 20 is typically considered to have a relatively high temperature. Therefore, in the case of attaching the heat exchange plate 100 of this application to the battery cell 20, the cooling zone 101A can be made overlap more with the central portion in the height direction of the battery cell 20, so that the heating zone 101B is mainly positioned at the end sides in the height direction of the battery cell 20. This helps to ensure temperature uniformity among the battery cells 20.
  • the packaging plate 102 is welded to the heat exchange plate body 101 in a manner that the heating film 103 is closely attached to the heat exchange plate body 101.
  • the heating film 103 is in close contact with the heat exchange plate body 101.
  • the close contact between the heating film 103 and the heat exchange plate body 101 is mainly achieved by a compressive applied by the packaging plate 102. Adhesive can be applied or not applied between the heating film 103 and the heat exchange plate body 101.
  • the close contact between the heating film 103 and the plate surfaces of the heat exchange plate body 101 and the packaging plate 102 allows for efficient transfer of heat from the heating film 103 to the battery cell 20 via the two plates, thereby improving heating efficiency.
  • the welding method of the packaging plate 102 spot welding, laser penetration welding, or the like can be used. Any suitable welding method can be used, provided that the packaging plate 102 is welded to the heat exchange plate body 101. Certainly, other connection methods that securely fix the packaging plate 102 can also be used.
  • the packaging plate 102 is fixed to the heat exchange plate body 101 through welding, reliable fixation can be achieved with easy operation and simple structure.
  • the heating film 103 can be closely attached to the heat exchange plate body 101 through welding connection, which ensures effective heating of adjacent battery cells 20 by the heating film 103 while avoiding adverse situations such as delamination of the heating film 103.
  • the packaging plate 102 is closely attached to the heating film 103 through a thermally conductive adhesive 105.
  • the thermally conductive adhesive 105 like thermally conductive silicone gel, is sandwiched between the heating film 103 and the packaging plate 102.
  • the thermally conductive adhesive 105 has a shape that is substantially the same as the shape of the heating film 103.
  • thermally conductive adhesive 105 is sandwiched between the packaging plate 102 and the heating film 103, close contact between the heating film 102 and the heat exchange plate body 101 can be further ensured, facilitating efficient heating of the battery cell 20. Furthermore, the use of the thermally conductive adhesive 105 helps to evenly transfer heat from the heating film 103 to the packaging plate 102, ensuring uniform heating of the battery cell 20.
  • the thermally conductive adhesive 105 is thermally conductive silicone gel.
  • thermally conductive silicone gel can improve the use reliability and service life of the heat exchange plate 100 and reduce maintenance costs.
  • the packaging plate 102 is welded to the heat exchange plate body 101 at a position avoiding the heating film 103.
  • the position on the packaging plate 102 avoiding the heating film 103 corresponds to the position on the packaging plate 102 that does not have the heating film 103 in the accommodating cavity 104.
  • the heating film 103 is formed in a ring shape as shown in FIG. 4
  • the position on the packaging plate 102 avoiding the heating film 103 includes an edge portion of the packaging plate 102 located around the heating film 103 and a portion corresponding to the middle position enclosed by the ring-shaped heating film 103.
  • the position on the packaging plate 102 avoiding the heating film 103 includes a portion of the packaging plate 102 that encloses the straight-line heating film 103.
  • the position on the packaging plate 102 avoiding the heating film 103 includes the edge portion of the packaging plate 102 located around the heating film 103.
  • the welding includes spot welding, continuous welding, and the like.
  • the packaging plate 102 is welded to the heat exchange plate body 101 at a position avoiding the heating film 103, heating performance of the heating film 103 is not compromised by the welding material or the welding position.
  • multiple or continuous welding can be performed around the heating film 103 at positions avoiding the heating film 103 to increase a compressive force that enables the heating film 103 to be closely attached to the heat exchange plate 100 and the packaging plate 102.
  • the heating film 103 is in a thin sheet form.
  • the heating film 103 is arranged serpentinely in the heating zone 101B in a closed ring or in a non-closed shape, and the packaging plate 102 includes a peripheral welding portion 106 and a central welding portion 107.
  • the peripheral welding portion 106 surrounds the heating film 103 at edge of the heating zone 101B, and the central welding portion 107 is located at a position in the heating zone 101B different from the peripheral welding portion 106 and avoiding the heating film 103.
  • FIG. 4 shows a closed ring shape as an example, but the heating film 103 can also be arranged serpentinely in a non-closed shape, provided that it can uniformly provide sufficient heat within the accommodating cavity 104.
  • the peripheral welding portion 106 of the packaging plate 102 surrounds the heating film 103 at the edge of the heating zone 101B and is closer to the heat exchange plate body 101 compared to the central portion of the packaging plate 102 that forms the accommodating cavity 104.
  • the peripheral welding portion 106 can be continuously formed around the periphery of the heating film 103 or, as shown in FIG. 5 , can have an opening at an end of the packaging plate 102 to allow a portion of the heating film 103 to extend out and connect with power lines or the like.
  • the central welding portion 107 of the packaging plate 102 is formed in a linear shape that matches the shape of the heating film 103, and fills the central space enclosed by the ring-shaped heating film 103.
  • the central welding portion 107 is closer to the heat exchange plate body 101 due to its recess towards the surface of the packaging plate 102 that forms the accommodating cavity 104.
  • the central welding portion 107 may also be formed in a serpentine shape that matches the shape of the heating film 103.
  • the heat exchange plate 100 can be made thinner, thereby avoiding causing the battery 10 to be excessively large due to the heat exchange plate 100.
  • the heating film 103 is arranged serpentinely in a closed ring or non-closed shape within the heating zone 101B, so that the heating film 103 can be distributed as evenly as possible throughout the heating zone or uniformly heat the entire heating zone.
  • the packaging plate 102 includes the peripheral welding portion 106 and the central welding portion 107
  • the peripheral welding portion 106 surrounds the heating film 103 and is formed at the edge of the heating zone 101B
  • the central welding portion 107 is located at a position in the heating zone 101B different from the peripheral welding portion 106 and avoiding the heating film 103.
  • welding can be performed around the periphery of the heating zone 101B (that is, the periphery of the packaging plate 102) to apply compressive force to the heating film 103, and welding can also be performed in the central portion of the heating zone 101B (the central portion of the packaging plate) to apply compressive force to the heating film 103, so that the entire heating film 103 is tightly pressed against the heat exchange plate body 101 and the packaging plate 102, and the heating film 103 in different portions of the heating zone receives approximately consistent stress.
  • a cooling flow path 110 is formed in the heat exchange plate body 101 of the cooling zone 101A for the passage of a cooling medium.
  • the cooling flow path can be formed by interconnected pipe cavities within the heat exchange plate body 101 (cooling zone 101A).
  • a cooling medium inlet 108 and a cooling medium outlet 109 are provided at the end of the heat exchange plate body 101.
  • the cooling medium can enter the heat exchange plate body 101 through the cooling medium inlet 108, circulate through the internal cooling flow path for heat exchange, and then exit through the cooling medium outlet 109, flowing into the overall cooling medium supply pipeline (not shown in the figure).
  • the cooling flow paths of the heat exchange plates 100 can be connected in series or in parallel. Considering higher cooling efficiency and balanced cooling, parallel connection is preferred.
  • the cooling zone 101A can function as a cooling plate when the cooling medium flows, cooling the adjacent battery cells 20.
  • both the heat exchange plate body 101 and the packaging plate 102 are aluminum components.
  • a battery is provided, as shown in FIG. 8 or FIG. 9 .
  • the battery includes at least one battery cell 20 and at least one heat exchange plate 100.
  • the heat exchange plate 100 is the heat exchange plate 100 described in the first aspect of this application and is positioned near the battery cells 20.
  • FIG. 8 three battery cells 20 and four heat exchange plates 100 are shown as an example, but persons skilled in the art should understand that the number of battery cells and heat exchange plates is not limited to this and can be arbitrarily set based on needs.
  • the number of heat exchange plates 100 can be more than, less than, or equal to the number of battery cells 20, provided that the overall cooling and heating requirements of the battery 10 are met and can be adjusted based on needs.
  • the heat exchange plate 100 is typically disposed near one or more battery cells 20 and can be in contact with the battery cells for better heat exchange effect.
  • the heat exchange plate 100 can be disposed near one side, two sides, all sides, or any end surface of the battery cell 20.
  • the heat exchange plate 100 is configured between adjacent battery cells 20a and 20b, as well as between battery cells 20b and 20c.
  • battery cells 20a and 20c are end cells in a battery group
  • the heat exchange plate 100 is also disposed near the side surfaces of these two battery cells.
  • FIG. 8 only shows the configuring of the heat exchange plate 100 near two sides of the battery cells, but the heat exchange plate 100 can also be disposed near other sides of the battery cells.
  • the heat exchange plates 100 are disposed near a first heat exchange surface of each battery cell 20.
  • the heat exchange plate of the battery cell includes a heat exchange surface facing the battery cell in the arrangement direction, referred to as the first heat exchange surface (sometimes referred to as a side surface of the battery cell). It further includes a heat exchange surface facing the casing, referred to as a second heat exchange surface. When an area of the first heat exchange surface is larger than that of the second heat exchange surface, the heat exchange plate 100 is at least disposed near the first heat exchange surface.
  • the heat exchange plate 100 is configured in a manner that the heat exchange surfaces face the heat exchange surfaces of the battery cells. Furthermore, because the central portion of the battery cell 20 is generally considered to have the most complete chemical reaction and the highest temperature rise, it is preferable to configure the cooling zone 101A of the heat exchange plate 100 to be as close as possible to the heat exchange surface of the central portion of the battery cell 20.
  • the heat exchange plate 100 is disposed near the relatively large heat dissipation surface of the battery cell 20 or near a heat exchange surface of the battery cell 20 with obvious uneven temperature distribution, so as to achieve uniform and efficient cooling and/or heating of the battery cell and the battery.
  • the heat exchange plate 100 configured between adjacent battery cells 20 have higher heat exchange capacity compared to the heat exchange plate 100 configured at the end sides.
  • the heat exchange capacity refers to the ability to exchange more heat, which can be achieved by increasing a cross-sectional area of the cooling flow path, increasing a flow speed of the cooling medium, increasing the heating power of the heating film, or using two heat exchange plates 100 in parallel.
  • a longer arrow indicates that the flow speed of the cooling medium of the heat exchange plate 100 positioned in the middle is greater than that of the heat exchange plates positioned on the sides.
  • the heat exchange plate 100 configured between adjacent battery cells 20 typically exchanges heat with both adjacent battery cells 20, and the heat exchange plate 100 configured at the end sides typically only exchanges heat with the end battery cells 20, having a heat exchange plate 100 sandwiched between adjacent battery cells 20 with a heat exchange capacity better than a heat exchange plate 100 disposed near the battery cell 20 at the end side helps ensure temperature uniformity for the entire battery.
  • the cooling flow path formed in any heat exchange plate body 101 for the passage of the cooling medium is connected in parallel with the cooling flow path formed in another heat exchange plate body 101 for the passage of a cooling medium.
  • the cooling flow paths of the heat exchange plates 100 are connected in parallel, so that the cooling flow path in each heat exchange plate can operate independently, thereby improving the cooling efficiency for each battery cell and further ensuring temperature uniformity for the entire battery.
  • the battery further includes a second heat management plate 200 disposed near the second heat exchange surface of the battery cells 20.
  • the heat exchange plate 100 is disposed near the first heat exchange surface in a manner that the cooling zone 101A is farther from the second heat management plate 200 than the heating zone 101B.
  • heat exchange plates 100 are configured between adjacent battery cells 20a, 20b, 20c, and a second heat management plate 200 is also disposed near the end surface of the battery cells (such as the bottom end surface in FIG. 9 ).
  • the second heat management plate 200 is composed of a cooling plate.
  • the cooling plate can adopt a known cooling plate structure.
  • the heat exchange plate 100 may be referred to as the first heat management plate. Because the battery cells are cooled from the side and bottom surfaces, the safety of the battery is further improved.
  • the heat exchange plate 100 serving as the first heat management plate, is configured in a manner that the heating zone 101B is closer to the second heat management plate 200 than in the cooling zone 101A.
  • the heat exchange plate 101 is disposed near the first heat exchange surface of the battery cell 20, serving as the first heat management plate.
  • a cooling second heat management plate 200 which is different from the first heat exchange surface can be further disposed near the second heat exchange surface, to further improve the cooling efficiency.
  • the heat exchange plate 100 is configured in a manner that the cooling zone 101A is farther from the second heat management plate 200 than the heating zone 101B, further enhancing the overall cooling efficiency and temperature uniformity of the battery.
  • the cooling flow path in the second heat management plate 200 is connected in parallel with the cooling flow path in the heat exchange plate 100.
  • any known methods can be used, provided that the basic functions described above are achieved.
  • the cooling flow paths between each heat exchange plate 100 and the cooling flow paths between the heat exchange plate 100 and the second heat management plate 200 are connected in parallel with each other, each can circulate independently, thereby further improving the cooling efficiency and temperature uniformity of each battery cell and the entire battery.
  • a manufacturing method of battery includes the following steps: providing at least one battery cell 20 (step S100); providing at least one heat exchange plate 100, where the heat exchange plate 100 is the heat exchange plate 100 described in the first aspect of this application (step S200); and positioning the heat exchange plate 100 near the battery cells 20 (step S300).
  • each battery cell as well as the entire battery, receive uniform and efficient cooling and/or heating, without occurrence of issues such as delamination, overheating, or short circuit of the heating film.
  • This battery exhibits high reliability and safety in use.
  • the method further includes the following steps: providing the second heat management plate 200 (step S400); and positioning the heat exchange plate 100 near the first heat exchange surface of the battery and positioning the second heat management plate 200 near the second heat exchange surface of the battery, where the cooling zone 101A of the heat exchange plate 100 is farther from the second heat management plate 200 than the heating zone 101B (step S500).
  • the step (step S200) of providing at least one heat exchange plate includes: providing a heating film that is closely attached to the heat exchange plate body and the packaging plate (step S201); and welding the packaging plate to the heat exchange plate body at a position surrounding the heating film in the heating zone and avoiding the heating film (step S202).
  • FIG. 9 an application example of the heat exchange plate 100 according to some embodiments of this application is shown.
  • the battery shown in FIG. 9 is a battery pack using the CTP (Cell To Package; non-module battery pack) scheme.
  • Each battery cell 20 is directly bonded to a bottom cooling plate serving as a second heat management plate 200, and the battery cells 20 have no side plates and are directly bonded to a heat exchange plate 100 serving as a first heat management plate.
  • the cooling liquid in the heat exchange plate 100 is designed in a parallel structure to ensure cooling effectiveness.
  • the flow rate of the middle heat exchange plate 100 between the battery cells is higher than that of the heat exchange plates on the sides, as the middle heat exchange plate 100 dissipates heat generated by the battery cells on both sides.
  • FIG. 4 is an exploded perspective view of the heat exchange plate 100.
  • the heat exchange plate 100 includes an aluminum-stamped heat exchange plate body 101, a heating film 103, a thermally conductive silicone gel 105, and an aluminum packaging plate 102.
  • the heating film 103 is packaged in the lower half of the heat exchange plate body 101, or the heating zone 101B, by bonding the packaging plate 102 with the heat exchange plate body 101.
  • the upper half of the heat exchange plate body 101, or the cooling zone 101A functions for cooling. This allows for cooling of the upper zone of the battery cells, which is farthest from the bottom cooling plate serving as the second heat management plate 200, while the heating film 103 heats the battery cells through self-heating using resistance wires and the like.
  • the packaging plate 102 includes an accommodating cavity 104 for the heating film 103, a peripheral welding portion 106 for spot welding the edge of the packaging plate, and a central welding portion formed by spot welding grooves.
  • the heating film 103 is securely packaged in the heat exchange plate body 101 through high-strength connections such as welding.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
EP21969372.8A 2021-12-28 2021-12-28 Wärmetauscherplatte, batterie, elektrische vorrichtung und herstellungsverfahren für batterie Pending EP4386935A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2021/142210 WO2023122994A1 (zh) 2021-12-28 2021-12-28 换热板、电池、用电装置及电池的制造方法

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EP4386935A1 true EP4386935A1 (de) 2024-06-19

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CN204947033U (zh) * 2015-07-21 2016-01-06 宁德时代新能源科技有限公司 锂二次电池模组
CN106654442A (zh) * 2016-11-14 2017-05-10 深圳市赛尔盈电子有限公司 一种动力电池冷却和加热集成系统及电池
CN206293584U (zh) * 2016-11-25 2017-06-30 江西迪比科股份有限公司 一种新能源动力电池
CN208889811U (zh) * 2018-10-24 2019-05-21 深圳市赛尔盈电子有限公司 液冷板及安装其的电池模组
CN113571796B (zh) * 2020-04-29 2023-10-17 比亚迪股份有限公司 温控组件及电池包
CN212988110U (zh) * 2020-07-06 2021-04-16 南京创源天地动力科技有限公司 一种集成加热与液冷的换热板总成
CN112490534A (zh) * 2020-12-02 2021-03-12 芜湖汇展新能源科技有限公司 冷热一体式液冷板

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